Answer:
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
A morbidly-named body of water
They have not flesh, nor feathers, nor scales, nor bone. Yet they have fingers and thumbs of their own. What are they?
There is a creature of God whose body is hard; it does not wish to eat unless you strike its head.
Something wholly unreal, yet seems real to I. Think my friend, tell me where does it lie?
What did the grape do when he got stepped on?